Lubricating-pump.



F. STHLI.

LUBRIGATING PUMP.

APPLICATION FILED APR. 16.1908. 093471 s 'Patented Jan. 12, 1909.

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FRITZ STAHLI, OF WINTERTHUR, .SWlTZERLAvN-D.

LUBRICATNGSPUNI-P.

'Specification of Letters Patent.

.Patented Jan. 12 1909.

.application filed April 16, 19.08. ,'SeralNoJmB.

To all whom it may concern:

Be it known that I, FRITZ S'rHLi, a citizen of the Republic of Switzerland, residing at l/Vinterthur, Switzerland, have invented certain new and useful Improvements in Lubricating-Pumps; and l do hereby declare the following t'o be a full', clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters or figures of referencemarked thereon, which form a part of this specifica- 'l"his invention relates to lubricating pum s having pressure and governing pistons. ih lubricating pumps of this kind the pressure and governing pistons have separate piston rods which are set in motion by means of eccentrics operated from some moving part of the engine or machine to be lubricated. W here the lubricating pump is employed on steam cylinders, a vacuum can draw the piston or working pressure may lift it, which may cause an irregular feed of oil to the cylindcr, and a penetration of steam into the oil container, or the same may be sucked empty by means of the vacuum. Dii'erential pistons have been provided in one cylinder but both acted as pressure pistons.

rIhe objects of the present invention are to provide a governing and a pressure piston arranged on a single piston rod which is lpositively.movable; means by which the oil to be forwarded at each stroke is measured; means to adjust the piston rod to alter the quantity i forwarded; and means by which direct communication between the oil container and the space lying beneath the governing piston is avoided in all positions of the governing piston.

1n the accompanying drawings, Figure 1 is a vertical section of a pumpeinbod ing the features of my invention. Fig. 2 a p an view partially in section. Figs. 3 and 4 are detail views illustrating the working positions of the iistons. Fig. 5 is an enlarged detail vertical section of one form of construction of the piston and Fig. 6 is a similar view of a modified form of construction of piston.

' referring to the drawings 1 designates the oil container, 2 an eccentric which is set in rotation from any movable part oi' the machine to be lubricated, 3 a yoke formed in 1 'two parts surrounding the eccentric and conl nccted with a guide rod 4. '0n each half of i l23 forming a chamber 30.

'the yokeare ormedlugs 5 and 6 said :halves being held together 'by screws 7. The lugs 5 and 6 have 'lateral recesses 8, Fig. 2, for the lateral insertion of screw bolts 9. These screw bolts 9 are held fast on the upper lugs 5 by means of nuts 10 and 11. llfhe nuts 1 1 being mounted in recesses 12 suitably shaped to their periphery 'prevent the screw bolts lfrom emergingl laterally through the lrecesses 8. On the lower end of each screw bolt 9 is formed a loop 13 in which the head 14 of a piston rod. 15 rests. The piston rods are mounted in cylinders 16 and carry governing pistons 17 and pressure pistons 18. A. portion `of the cylinder is contracted at 19 to substantially the diameter of the governing piston forming a measuring chamber 31. The pressure piston 18 has, as a stuiiing box, a spiral s ring 2) the coils of which are somewhat inc ined to the axis and of rectangular section.

The governing piston is hollow and in the form of construction shown in Fig. 5, is secured at its bottom by means of screw threads 22 formed oma prolonged portion 23/ of a reduced end 23 of the piston rod 15, by which means an annular recess is formed. ln the form of construction shown in Fig. 6 vthe prolonged portion 23 is omitted and the governing piston is secured at its top to threads 22 formed on the reduced portion The cylinder 16 has oil admission apertures 24 and the governing piston 17 is closed at the bottom and has oil admission apertures 25 and oil outlet apertures 26.

l27 designates the pi e leading to the machine to be lubricatet', for instance to the cylinders of a locomotive, in which pipe a non-return valve may be inserted, but which is notI absolutely necessary.

The operation of the lubricating ump is as follows: When the pistons 17 ant 18 are in the position shown in Fig. 1, oil iiows from the oil container 1 through the o enings 24 into and fills the chambers 31. Now if the piston rod descends as shown in Fig. Sthe openings 24 are closed and the oil contained in the chamber 31 is forced through the openings 25 into chamber 30 and out through the openings .26 under the pistons 17 into the npe 27. ilo pressure on the oil. Now if the piston again rises from lthe lowest position Fig. 4, the openings 24 remain closed so long as the openings 26 are open. During this operation T he governing piston thus exerts it is therefore not possible for steam to How into the oil container l or the latter' to be drawn empty by the Vacuum in the cylinder the eccentric 2 however remains constant, so.

that the piston is revented from being influenced by the woliling pressure or Vacuum, and thereby an incorrect governing, as is frequently possible in the lubricating pumps with separate governingand pressure pistons, is avoided.

The suspension of the piston rod 15 by the head 13 in the loop 14 is a flexible one, without producing a deadpoint and prevents the piston from sticking in the cylinder 16.

I claim:

l. In a lubricating pump, the combination of a container having a discharge aperture, a piston controlling the aperture having a hollow dispensing member of smaller diameter provided with inlet and discharge ports.

2. In a lubricating pump, a container, a cylinder having an oil inlet, a piston in the cylinder having a hollow reduced end ortion closing the end of the cylinder, sai( reduced end provided with inlet and discharge openings.

3. In a lubricating pump, a container, a cylinder therein having an inlet ort and a contracted end portion, an oil de ivery conduit, a piston in the cylinder controlling the inlet port and having a hollow reduced end portion -fitting into and closing said contracted portion and forming an annular recess above the latter, said reduced portion having an inlet port communicating with the annularchamber and having an outlet adapted to communicate with the delivery conduit.

4. In a lul ricating pump, a container, a cylinder therein having an inlet ort and a contracted end portion, an oil de ivery conduit, a piston in the cylinder controlling the inlet port and having a hollow reduced end portion fitting into and closing said con- The tracted portion and forming an annular recess above the latter, said reduced portion having an inlet port communicating with the annular chamber and having an outlet adapted to communicate with the delivery conduit and means to regulate the size of the annular recess.

5. In a lubricating ump, the combination with a container, o' a cylinder having an oilinlet, a piston in the cylinder having a hollow reduced end portion closing the end of the cylinder, said reduced portion provided with inlet and discharge openings, a

` `reciprocable member, and means to flexibly connect the piston andreciprocal. le memter.

6. A lui/ricating pump comprising a container, a cylinder mounted in the container having a discharge port therein, a conduit, a pressure piston reciprocahly mounted in the cylinder-adapted to open and close said port, and a hollow governing piston of smaller diameter.' than the ressure piston connected to the latter and liaving an inlet communicating with the cylinder and an outlet adapted to communicate with the conduit.

7. In a luhricating pump, the combination with a container and a conduit, of a cylinder mounted in the container having a discharge port, a pressure piston mounted in the cylinder' adapted to control said port, a hollow governing piston of smaller diameter than the pressurepiston carried ly the latter and having an inlet communicating with the cylinder and an outlet lielow the inlet adapted to communicate with the conduit when the discharge port is closed.

8. In a lubricating pump, the combination with a container, of a cylinder' having an oil inlet, a piston in the cylinder having a flange on one end and a perforated hollow reduced portion on the other end closing the cylinder, and forming an annular recess in the latter, an eccentric, a yoke surrounding the latter, a l :olt adjustal le in the yokchaving an open loop on one end to receive the flange of the piston.

In testimony that I claim the foregoing as my invention, I have signed my naine in presence of two subscribing witnesses.

FRITZ STAHLI.

Witnesses:

ERNST FISCHER, Josnrn SIMON. 

